US7154522B2 - Quality printing method, printing machine, and corresponding printing substance - Google Patents

Quality printing method, printing machine, and corresponding printing substance Download PDF

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Publication number
US7154522B2
US7154522B2 US10/506,591 US50659105A US7154522B2 US 7154522 B2 US7154522 B2 US 7154522B2 US 50659105 A US50659105 A US 50659105A US 7154522 B2 US7154522 B2 US 7154522B2
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Prior art keywords
printing
energy
process according
absorption
absorption bodies
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US20050212888A1 (en
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Udo Lehmann
Dirk Meyer
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LPKF Laser and Electronics AG
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Aurentum Innovationstechnologien GmbH
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/0057—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material where an intermediate transfer member receives the ink before transferring it on the printing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0052—Digital printing on surfaces other than ordinary paper by thermal printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/02—Dye diffusion thermal transfer printing (D2T2)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/30—Thermal donors, e.g. thermal ribbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38257—Contact thermal transfer or sublimation processes characterised by the use of an intermediate receptor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/46—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers

Definitions

  • the present invention relates to a printing process for the transfer of printing substance from an ink carrier onto an imprinting material, in which, with the help of an energy-emitting apparatus which emits energy during a process period in the form of electromagnetic waves, the printing substance undergoes a change in volume and/or position, and for example as a result a transfer of a printing point onto the imprinting material takes place, as well as a printing machine and a printing substance for this.
  • a printing process is meant primarily a process for the reproduction as often as required of text and/or image patterns by means of a printing plate which is re-inked after each impression.
  • a distinction is made here between four basically different printing processes.
  • the relief printing process in which the printing elements of the printing plate are raised, while the non-printing parts are recessed.
  • This includes for example letterpress printing and so-called flexographic or aniline printing.
  • flatbed-printing processes are known in which the printing elements and the non-printing parts of the printing plate essentially lie in one level.
  • printers are already used which are often connected to an electronic data processing system. These use generally digitally triggerable printing systems which are in a position to print individual printing points as required. Such printing systems use various processes with different printing substances on different imprinting materials. Some examples of digitally triggerable printing systems are: laser printers, thermal printers and ink jet printers. Digital printing processes are characterized by the fact that they do not require printing plates.
  • an electro-thermal ink jet printing process for example from GB 2 007 162, in which the water-based ink is briefly heated in a suitable ink jet by electrical pulses until it boils, with the result that a gas bubble suddenly forms and an ink drop is ejected from the jet.
  • This process is generally known by the term “bubble-jet”.
  • these thermal ink printing processes have in turn the disadvantage that on the one hand they consume a great deal of energy for the printing of an individual printing point and on the other hand they are suitable only for printing processes which are water-based. Furthermore, every single printing point must be triggered separately by the jet.
  • piezoelectric ink printing processes suffer from the disadvantage that the required jets are easily blocked, with the result that only special and expensive inks can be used for this.
  • the energy can be either transferred directly into the printing substance or firstly into an absorption layer which is applied to the ink carrier, and which in turn emits the energy to the printing substance.
  • special printing substances must be used which are capable of absorbing the energy. This severely restricts the variety of printing inks that can be used.
  • the absorption of the light in the printing ink takes place within a relatively large volume passed through by the laser beam. With some inks the energy is also not completely absorbed. The absorption is also strongly dependent on the printing substance used and the actual thickness of the printing substance on the ink carrier.
  • the printing substance is heated indirectly by introducing the energy firstly into an absorption layer, the required energy is generally even higher as, in addition to the printing substance, the absorption layer must also now be heated.
  • the heat conduction in the absorption layer must not be ignored, with the result that a larger area of the absorption layer is necessarily heated, which likewise increases the required energy.
  • even a detachment of the absorption layer often occurs.
  • the object of the present invention is therefore to provide a printing process which has an improved printing quality and which requires much less energy for printing a printing point, but which at the same time allows a high printing speed with high resolution capacity.
  • the object of the present invention is also to provide a corresponding printing machine and a corresponding printing substance with which the printing process according to the invention can be realized.
  • the invention includes a printing process for the transfer of printing substance ( 2 ) from an ink carrier ( 1 ) to an imprinting material ( 6 ), in which, with the help of an energy-emitting apparatus, which, during a process period, emits energy in the form of electromagnetic waves ( 3 ), and the printing substance ( 2 ) undergoes a change in volume and/or position, wherein, with the help of absorption bodies ( 4 ), energy is transferred from the electromagnetic waves ( 3 ) into the printing substance ( 2 ).
  • the invention also includes an apparatus for practicing the process of the invention and a printing substance containing absorption bodies.
  • FIGS. 1A through 1C show schematic representations of the operating principle of a first version of the process
  • FIGS. 2A and 2B show a schematic representations of the operation of a process of the state of the art
  • FIGS. 3A and 3B show a schematic representations of an advantageous effect of the first version of the printing process according to the invention
  • FIG. 4A through 4C show a schematic illustrations of a second version of the process according to the invention.
  • FIGS. 5A and 5B show a schematic representations of the influence of the correct energy parameters
  • FIGS. 6A and 6B show a schematic representations of the influencing of the printing-point size
  • FIG. 7 shows a schematic representation of the influence of the microstructure on the printing point
  • FIG. 8 shows a schematic representation of the influence of light-focussing elements
  • FIGS. 9A and 9B show exemplary arrangements of the light-focusing elements
  • FIG. 10 shows another version in a “negative” arrangement
  • FIG. 11 shows another version with an additional, interposed ink carrier.
  • the object is achieved in that the energy is transferred from the electromagnetic radiation into the printing substance with the help of absorption bodies.
  • the electromagnetic wave penetrates far into the printing substance and is absorbed along a relatively large area.
  • a relatively large area of the printing substance must be heated until a gas bubble forms.
  • the effect of using absorption bodies is that the electromagnetic wave is absorbed essentially at the surface of the absorption body, i.e. over a much smaller area.
  • a heating occurs at certain points with the result that the desired change in volume and/or position of the printing substance already takes place earlier.
  • a delay in boiling can be effectively prevented through the presence alone of the boundary surfaces between printing substance and absorption bodies which act as a type of crystal nucleus.
  • Another preferred version of the process according to the invention provides that through the induced change in position, some of the printing substance is detached from the ink carrier and the ink carrier than comes directly into contact with the imprinting material with the result that, at those points at which a change in position has been induced, no transfer of printing substance onto the imprinting material takes place.
  • the electromagnetic wave is directed to those areas which are not to transfer printing substance.
  • absorption bodies are used which are smaller than the wavelength of the electromagnetic waves, preferably smaller than a tenth, particularly preferably smaller than a fiftieth of the wavelength of the electromagnetic waves.
  • the absorption effect is further increased as the waves are no longer scattered at such smaller bodies, but exclusively absorbed.
  • the energy-emitting apparatus emits energy in the form of laser light.
  • highly coherent monochromatic laser light a relatively high amount of energy can be emitted onto a very small area with very short light pulses.
  • a short light pulse need not necessarily come from a pulsed laser. It is, rather, actually advantageous if a laser is used in CW operation instead.
  • the pulse duration or better the exposure time does not then depend on the length of the laser pulse but on the scanning speed of the focus.
  • the data to be transferred need no longer be synchronized to the fixed pulse frequency.
  • a printing substance which contains the absorption bodies.
  • a further particularly preferred version provides that the absorption bodies absorb essentially all the light wavelengths. This ensures that the absorption is as complete as possible.
  • the consequence of this in particular when the absorption bodies are contained in the printing substance, can be that not all colours, in particular no bright colours, can be used as the colour of the printing substance is changed by the addition of the absorption bodies which absorb essentially all the light wavelengths.
  • the absorption bodies essentially absorb only radiation with a wavelength or in a wavelength range which corresponds to the wavelength or the wavelength range of the electromagnetic waves emitted by the energy-emitting apparatus.
  • the absorption bodies thus merely filter the light of the energy-emitting apparatus out of the incident light, while all the other light wavelengths can pass unhindered, with the result that the influence of the absorption bodies on the colour of the printing substance is negligible.
  • the variety of the printing substances to be used can be clearly increased, as the absorption bodies need merely be added to the printing substances.
  • the absorption bodies as a dye or pigment.
  • the energy-emitting apparatus or the beam path of the electromagnetic waves are arranged such that the absorption bodies are accelerated through the electromagnetic waves of the energy-emitting apparatus in the direction of the imprinting material.
  • the change in volume and/or position of the printing substance is supported in advantageous manner.
  • the acceleration of the absorption bodies alone results in a type of shock wave in the printing substance with the result that, in combination with the forming gas bubble, a defined drop detachment is favoured.
  • the ink carrier is designed transparent and the light beam from the side of the ink carrier facing away from the printing substance is focussed through the former into the printing substance.
  • a gas bubble then forms explosively which ensures the acceleration of the absorption body in the direction of the imprinting material.
  • the absorption bodies are arranged in the printing substance.
  • an ink carrier is used according to the invention on the surface of which, provided to receive the printing substance absorption bodies are present which preferably form a solid layer.
  • the printing substance comes into contact with the absorption body as directly as possible.
  • the printing substance need not surround the absorption bodies completely. Because the energy is now no longer absorbed in an absorption layer, but on an absorption body, the surrounding area is heated only very slightly. It is thus possible through the process according to the invention to heat the—preferably very small—absorption body in a targeted manner without losses occurring due to heat conduction.
  • the printing-point size can now advantageously be controlled through the amount of energy emitted by the energy-emitting apparatus.
  • This control can be effected for example by varying the process period or the pulse duration.
  • the printing-point size can also be controlled by the profile of the laser light.
  • profile of the laser light is meant various transverse electromagnetic modes TEM.
  • Differences in brightness of the image to be printed can advantageously be achieved by variation of the printing-point size.
  • the process period or the pulse duration is shorter than 1 ⁇ s, preferably shorter than 250 nanoseconds, particularly preferably shorter than 100 nanoseconds and best of all shorter than 50 nanoseconds.
  • an energy density higher than 500 kW/cm 2 , preferably higher than 2 MW/cm 2 and particularly preferably higher than 10 MW/cm 2 is achieved at the surface of the irradiated absorption body.
  • the above measures for improving the printing quality are also based, among other things, on a novel raster method, which is preferably used in the present invention, but which in principle can also be used independently of the other features of the present invention.
  • This consists of a line spacing in which printing occurs line-by-line and the individual lines have a very tight distance between each other and even touch in an ideal case, with the result that in vertical direction the resolution is set by the distance between lines or the line width.
  • no fixed point raster is provided in horizontal direction. Instead the “pixels” consist in horizontal direction of line segments of the respective raster lines of varying length with any chosen starting and end point.
  • the scanning of the individual lines preferably takes place with a continuous wave laser which according to requirements is simply masked or switched off or its energy is reduced, so as to not print individual sections of the raster lines, while those line segments where the laser is not masked or turned off are printed.
  • the laser itself continues to operate in continuous wave mode in principle.
  • the length of a printed line segment depends simply on the length of the switching-on or revealing time of the laser on the respective line.
  • a printed line thus consists of a sequence of line segments which in general are of different length, their length being determined simply by the switching-on time of the laser, the individual line segments having a line width which essentially remains constant, which ideally corresponds exactly to the distance between adjacent scanning lines or can even be slightly larger (or smaller).
  • the position of the individual line segments i.e. in particular their start and end, is not specified by any one grid, but can be varied as desired.
  • the corresponding printing process is strictly speaking screened only in vertical direction, i.e. perpendicular to the pattern of the individual printed lines, while a “continuous” printing takes place within the lines, i.e. in principle a continuous line is printed which can however be interrupted at any chosen points and for any lengths, with the result that the printed line sections are corresponding line segments of constant width and any choosable length.
  • the laser used is preferably a phase-coupled or a CW laser with an average output of more than 10 watts and a beam parameter M 2 ⁇ 1.5.
  • the “switching-on” and “switching-off” of the laser expediently takes place via a pulse-width modulator in combination with a suitable laser switch (e.g. AOM, EOM).
  • a suitable laser switch e.g. AOM, EOM.
  • the laser beam is not fully “turned off” but is only reduced in its energy or energy density to below a threshold limit beneath which there is no detachment of dye drops from the ink carrier. For example there is a reduction in the laser output to 15% of the value used for a full printing point.
  • the laser can thus be used at order 0, while conventional applications of AOM switches have to use the 1 st diffraction order.
  • the laser has a wavelength between 0.5 ⁇ m and 3 ⁇ m.
  • the selected thickness of the printing substance on the ink carrier should be less than 50 ⁇ m, preferably less than 30 ⁇ m, particularly preferably less than 20 ⁇ m.
  • the thickness of the printing substance layer should not fall below 5 ⁇ m, however.
  • the optimal range is between 10 and 15 ⁇ m.
  • the printing substance is selected such that the viscosity lies between 0.05 and 0.5 Pas.
  • the energy required can be even further reduced if absorption bodies and printing substance are selected such that the absorption bodies are wetted as well as possible by the printing substance. It is thereby ensured that the energy applied to the absorption body is dissipated in the printing substance as directly as possible.
  • the object mentioned at the start is achieved by means of a printing machine for printing on an imprinting material which has an ink carrier and an energy-emitting apparatus which is arranged such that the energy can be transferred in a targeted manner to certain areas of the ink carrier, absorption bodies being provided for absorbing the energy.
  • the energy-emitting apparatus is preferably a laser.
  • the absorption bodies have a size smaller than 1 ⁇ m, preferably smaller than 200 nanometers and particularly preferably a size between 10 and 50 nanometers. With such small absorption bodies it is ensured that almost no light scattering occurs.
  • the absorption bodies preferably consist of carbon black particles.
  • the absorption bodies are preferably arranged in an absorption layer applied to the ink carrier.
  • the proportion of absorption bodies in the absorption layer is more than 40 wt.-%, preferably more than 70 wt.-% and particularly preferably more than 90 wt.-%.
  • the absorption layer consists of pressed absorption bodies.
  • the absorption bodies can also be embedded in an organic or inorganic polymer matrix, such as e.g. polysilicates but also epoxy resin. It is also possible to embed the absorption bodies in an elastomer matrix, for example rubber. It is thereby ensured that the absorption bodies are arranged largely separated from one another.
  • an organic or inorganic polymer matrix such as e.g. polysilicates but also epoxy resin. It is also possible to embed the absorption bodies in an elastomer matrix, for example rubber. It is thereby ensured that the absorption bodies are arranged largely separated from one another.
  • the ink carrier consists of a transparent polymer strip (polyester), because there is then a good wettability for printing substances based on an alcoholic, aqueous or aromatic solvent.
  • the object mentioned at the start is achieved by a printing substance which contains absorption bodies.
  • These absorption bodies advantageously are of a size smaller than 1 ⁇ m, preferably smaller than 200 nm and particularly preferably between 10 and 50 nm.
  • the printing substance consists of binder, dye or pigment, solvent, additives and the absorption bodies.
  • the absorption body forms the dye, i.e. the absorption body has a natural frequency band in the visible region, with the result that selectively determined frequency areas are absorbed.
  • a further advantageous version provides that the printing substance has a blowing agent.
  • a blowing agent is an agent which boils at a relatively low temperature, so that gas bubbles already form at a low temperature. A further reduction of the energy to be supplied can thereby be achieved.
  • Printing substances which boil at a temperature ⁇ 100° C. are particularly suitable.
  • the blowing agent is used as solvent at the same time. Alcohols, esters, ketones and water among others may be used as blowing agent. In the case of solvent-free inks, e.g. offset inks or UV inks, blowing agents are expediently added.
  • blowing agent content should be less than 30 wt.-% overall, however.
  • the described printing substance is used in the described printing process according to the invention and/or in the described printing machine according to the invention.
  • the printing machine contains a printing carrier which has a surface structure consisting of recesses and elevations, which is designed such that it acts at least partly focussing on a shock wave produced on or immediately above the surface of the ink carrier.
  • These microstructures e.g. recesses or elevations, are firstly to be smaller than a typical laser beam diameter which is used to produce the shock wave by local heating of the printing substance and they should above all be arranged periodically in at least one dimension, with the period also having a shorter repetition interval than corresponds to the typical diameter of the laser beam. It is also sufficient if there is also microstructurization in essentially only one direction, i.e. if the microstructures consist of e.g.
  • the recesses or elevations have a diameter or distance of the order of magnitude of 30 ⁇ and smaller, preferably smaller than 15 ⁇ .
  • the focussing effect is achieved for the pressure waves in a similar way as for the electromagnetic, in particular optical waves. Specifically, therefore, slightly concave shapes, e.g.
  • grooves with an elliptical or concave, optionally also circular cross-section are provided, where the focussing direction should run as perpendicular as possible to the enveloping surface of the ink carrier, in order that the dye drops ejected essentially perpendicular to the enveloping surface of the ink carrier by a correspondingly directed shock wave have as short a path as possible to the imprinting material and thus have as small as possible a divergence.
  • the exact design of the recesses depends among other things on the irradiation direction of the laser beam and on whether the laser beam is directed onto an absorption layer or whether absorption bodies are contained in the printing ink itself.
  • the focusing effect of specific structures can also theoretically be determined according to the rules of optics or optical reflection and/or refraction.
  • the result of a laser beam striking in the area of corresponding structural elements is a very sudden local heating and/or evaporation of the blowing agent, with the result that an explosive pressure wave develops at the site of the heating.
  • This pressure wave is either produced at the base of the ink carrier itself or is reflected there, with the result that on this basis the preferable alignment and focussing of the pressure wave in a preset surface structure can already be easily estimated.
  • microstructurization and the restriction of the microstructures to characteristic dimensions, which are even smaller than the diameter of the laser beam scanned away via the ink carrier are thus also important because, in contrast to the state of the art, the afterflow of ink into the microstructures is to be as unrestricted and rapid as possible. Because of the small size of the microstructures the ink layer is also always thicker than the depth of the microstructures, with the result that for these reasons alone the individual recesses cohere over the ink layer.
  • elevations attached in a targeted manner periodically and on a small scale can also be designed such that they have a corresponding focussing effect.
  • FIG. 1A shows diagrammatically the situation in the case of a printing process of the state of the art.
  • a laser beam 3 is focussed into the printing substance 2 through the ink carrier 1 .
  • the laser beam thus passes through the ink carrier into the printing substance and is absorbed over a large area.
  • the result is that the energy requirement for printing a point is very high, which slows down the printing process and thus reduces the printing speed.
  • FIG. 1B shows diagrammatically a first version of the printing process according to the invention.
  • absorption bodies 4 are introduced into the printing substance 2 .
  • the laser beam 3 now ensures that the surface of the absorption body 4 heats up strongly, with the result that the energy introduced by the laser beam 3 essentially leads to a punctiform heating of the absorption body 4 .
  • Absorption body 4 and printing substance 2 are advantageously selected such that the printing substance 2 wets the absorption bodies 4 very satisfactorily, with the result that the absorption bodies 4 and the printing substance 2 produce a homogeneous suspension.
  • an essentially punctiform heating of the printing substance 2 is achieved at the point at which the printing substance 2 wets the absorption body 4 .
  • the absorption bodies have an average size of approximately 1 ⁇ m.
  • FIG. 1C shows essentially the same situation as FIG. 1B , except that here the absorption bodies are very much smaller, namely very much smaller than laser light wavelength.
  • the absorption effect is further enhanced as, when the light beam 3 strikes an absorption body 4 , only light absorption is still brought to bear, but not light scatter.
  • the satisfactory wetting of the absorption bodies 4 by the printing substance can be achieved for example in that both absorption bodies 4 and also the printing substance 2 are designed polar, e.g. an alcohol can be used as solvent. Because of the electrostatic attraction, this automatically leads to satisfactory wetting.
  • the printing substance is designed less polar, if for example benzene or toluene is used as solvent, then the absorption bodies should also be as non-polar as possible, in order to guarantee satisfactory wetting.
  • the absorption body 4 can be developed such that it absorbs light with essentially all the light wavelengths. The result is the most complete possible absorption of the emitted laser light by the absorption bodies. However it is also possible to develop the absorption body 4 such that it absorbs only light of the corresponding laser wavelength. As an alternative to this, the absorption bodies 4 can also absorb light of whole wavelength ranges, with the result that the absorption bodies 4 are used simultaneously as dye or pigment.
  • FIGS. 2A and 2B once again show diagrammatically a printing process known from the state of the art.
  • FIG. 2A it can be seen that the printing substance 2 is applied to the ink carrier 1 .
  • a laser beam is focussed into the printing substance through the ink carrier 1 , vapour bubbles 8 form in the printing substance 2 .
  • the energy of the laser beam 3 is absorbed over a large area, with the result that the energy requirement is very high.
  • the forming vapour bubbles 8 in addition emit a printing pulse essentially in all directions, which can lead to uncontrolled disturbances in the movement of the printing substance 2 , with the result that in general no defined drop can become detached, but the printing substance is sprayed in uncontrolled manner.
  • FIGS. 4A to 4C show a second version of the process according to the invention.
  • FIG. 4 a once again shows diagrammatically a printing process from the state of the art.
  • a laser beam 3 is passed through the printing substance 2 onto an absorption layer 4 , which is applied to an ink carrier (not shown).
  • the absorption layer 4 is clearly heated by the laser beam 3 .
  • this does not take place just in punctiform manner, as the heat can spread relatively rapidly in the absorption layer.
  • the absorption layer 4 contains absorption bodies 8 .
  • the effect of the absorption bodies 8 is that the heat is essentially focussed in a limited manner on a local area, with the result that in a very short time the detachment of a drop from the printing substance 2 can be achieved with relatively little energy, as symbolized by the inkjet 5 .
  • the absorption bodies 4 are chosen to be as small as possible, i.e. so far as possible very much smaller than 1 ⁇ m in diameter, and can for example consist of carbon black particles.
  • the proportion of absorption bodies 4 in the absorption layer 9 is as high as possible.
  • the absorption layer 9 advantageously even consists completely of pressed absorption bodies. It is also possible to embed the absorption bodies in an organic or inorganic polymer matrix or in an elastomer matrix, such as e.g. rubber.
  • an electrothermal heating element such as is used for example in the bubble-jet process mentioned at the start, requires between 20 and 30 ⁇ J of energy for a printing point with a diameter of approximately 100 ⁇ m.
  • the energy consumption in the case of direct laser absorption i.e. the energy required per printing point in the case of a printing process without absorption bodies, is in general even higher.
  • the printing substance 2 can either be present in cells or in other regular structures, such as are known for example from DE 197 46 174, mentioned at the start, or else be designed as a homogeneous colour film.
  • the advantage of the continuous homogeneous colour film is that the laser beam does not have to be directed into preset structures, such as occurs for example through the cells, but can be directed independently to any desired position, with the result that the printing process operates independently of resolution.
  • the printing substance is no longer guided, with the result that the printing points lose some sharpness.
  • the process energy in the laser focus lies clearly above the threshold value (very much greater than 500 kW/cm 2 ) at a laser wavelength of approximately 1 ⁇ m, the ejection of a drop occurs due to the very high rate of heating up in such a short time that a shock wave spreads perpendicular to the surface in the direction of the imprinting material and the adjacent printing substance is a kind of guide because of its mass moment of inertia.
  • FIG. 5A shows the situation in which the preset printing parameters are observed.
  • the laser beam 3 is focussed into the printing substance 2 , with the result that a drop 5 detaches from the printing substance 2 and generates a defined sharp printing point 7 on the imprinting material 6 .
  • FIG. 5B shows the situation in which the preset parameters are not observed.
  • the energy used here is clearly higher and the whole area surrounding the focus is also heated up, the result here is an uncontrolled ejection of a drop 5 , with the result that a much larger printing point 7 forms on the imprinting material 6 .
  • FIGS. 6A and 6B show how, according to the invention, the printing-point size can be changed by variation of individual printing parameters. Tests have shown that the size of the printing point and the colour density of the printing point increase with increasing exposure time, i.e. with the pulse duration of the laser. The size of the printing point can thus be varied in almost infinitely small steps. Differences in brightness in the image to be printed can therefore be represented by printing points of different size. Overall it is possible, through the printing process according to the invention, to clearly improve the print format. The resolution can be increased almost at will, as the printing process is not connected with any kind of preset raster.
  • FIG. 7 shows a further preferred version of the invention.
  • the ink carrier 1 has a surface with recesses and/or elevations.
  • the recesses are here applied in the form of grooves 10 .
  • the recesses and/or elevations 10 preferably have a diameter of less than 25 ⁇ m.
  • the respective depth and height of the recesses and/or elevations is also preferably less than 25 ⁇ m.
  • the structure is thus extremely fine.
  • the printing substance forms a continuous surface on the structure of the ink carrier, as also shown in FIG. 6 .
  • the laser beam 3 passes from behind through the transparent ink carrier 1 .
  • the microstructure applied to the ink carrier 1 which can also have the form of cells and/or grooves, ensures that the shock wave conveyed through the absorption bodies runs as far as possible perpendicular to the surface of the ink carrier 1 . Surprisingly in several tests it was established that, by suitable “roughening” of the surface of the ink carrier, the quality of the generated printing point 7 on the imprinting material 6 can be considerably enhanced.
  • the microstructure is irregularly structured in a particularly preferred version, i.e. the individual recesses and/or elevations vary in their extent and depth. A variation of approximately 10–50% of the dimension of the recess and/or elevation is advantageously chosen.
  • the elevations and/or recesses are expediently formed such that the shock wave produced upon striking of the electromagnetic wave is advantageously shaped, with the result that the cleanest possible printing point forms.
  • FIG. 8 shows a further version of the present invention.
  • light-focussing elements 11 are applied to the ink carrier 1 .
  • These light-focussing elements form a microlens system which ensures that the incident focussed light beam is once again split into several small focal spots, so-called “hot spots”. The result of this is that the energy density is further increased at certain points, with the result that the energy to be introduced overall can be still further reduced.
  • the individual light-focussing elements 11 are smaller than the focus of the laser, i.e. smaller than 30 ⁇ m, preferably smaller than 15 ⁇ m, and particularly preferably smaller than 10 ⁇ m.
  • the light-focussing elements can, in the arrangement shown in FIG.
  • a transparent ink carrier 1 in principle be arranged both on the side of the ink carrier 1 facing away from the printing substance 2 , and also on the side of the ink carrier 1 wetted with printing substance 2 .
  • the light-focussing elements can also be integrated into the ink carrier 1 .
  • FIGS. 9A and 9B show versions with different arrangements of the light-focussing elements 11 .
  • FIG. 10 shows a “negative” arrangement of the printing process according to the invention.
  • the laser beam 3 which is focussed on the ink carrier 1 , can be seen.
  • the cylindrical ink carrier 1 is in contact on one side with a dipping roller 14 which in turn dips into a bath with printing substance 2 .
  • Upon rotation of the dipping roller and the ink carrier 1 it is ensured that the surface of the ink carrier 1 is covered with printing substance 2 .
  • FIG. 11 shows a further version of the present invention in which, between an inking roller with an absorption layer, onto which the laser is directed, and the printing material guided over a supporting roller, or the web to be imprinted, a continuous blanket guided over several rollers is provided as print transfer medium.
  • This can in particular be a rubber blanket, rubber blankets having the favourable property that they can be guided over particularly narrow radii of curvature.
  • the supporting or carrying roller for the rubber blanket arranged opposite the inking roller, can then have a relatively small diameter, such that it is possible to allow the laser to strike the absorption layer of the inking roller at a relatively steep angle and yet in very close proximity to the rubber blanket, with the result that the drops of ink thereby detached have only a very short distance to travel before they reach the rubber blanket.
  • the rubber blanket is then guided over a printing roller, which lies opposite a supporting roller for the printing web, with the result that the ink can be transferred from the rubber blanket onto the printing web.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Printing Methods (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
US10/506,591 2002-03-07 2003-02-19 Quality printing method, printing machine, and corresponding printing substance Expired - Fee Related US7154522B2 (en)

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DE10210146A DE10210146A1 (de) 2002-03-07 2002-03-07 Qualitätsdruckverfahren und Druckmaschine sowie Drucksbustanz hierfür
DE10210146.9 2002-03-07
PCT/DE2003/000500 WO2003074278A1 (fr) 2002-03-07 2003-02-19 Procede d'impression de qualite et machine d'impression et substance d'impression a cet effet

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AT (1) ATE428568T1 (fr)
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WO2003074278A1 (fr) 2003-09-12
DE50311417D1 (de) 2009-05-28
ATE428568T1 (de) 2009-05-15
DE10210146A1 (de) 2003-09-25
AU2003218613A1 (en) 2003-09-16
US20050212888A1 (en) 2005-09-29
EP1485255A1 (fr) 2004-12-15
CA2518185A1 (fr) 2003-09-12
JP2005518965A (ja) 2005-06-30
CA2518185C (fr) 2010-09-21
EP1485255B1 (fr) 2009-04-15

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